Jolt molding machine



2 Sheets-Shen 1 Filed Feb. 2o, 1946 i I INVENTOR. faz@ G. M )L 9 2 gl ogy Dec. 211, 194s. C, YOUNG 2,456,663

JOLT HOLDING MACHINE IN VEN TOR.

Patented Dec. 21, 1948 UNi'rEio- PATENT OFFICE .IOLT MOLDIN G MACHINE LesterfC; lYoung, Cleveland, Ohio,` assignor to. Spo, Inc., a corporation-of 1 Ohio Application February 20, 1946;Y Serial No. 648,997"

tive toan' anvil uponwhichstheljolt table rests inl its lowermost position'. IIn operation, the jolt table is raised "a predetermi-nemdistance abovethe anvil, and then therfluid" is exhausted1 from the uid lifting chamber, which permits thejolttable tov fall by gravityand strike theanvil forpro ducing a jolting operation `to'- aid; inA compacting theLmoldnlgJ: sand or'other'materialinithefmolding flask or othercontainer; As-the-piston `and cylinder move extensively relative to Aeach other for raising thejoltf'table,'thereisan exposure of the relative movable vportionl of-'thepiston. This exposed portion ofsthefpiston is normaly subjected rto a considerable amount o'irno'lding sand or other foreigna-brasivematerials vwhich comes in contact therewith'V during the j-olting operations .oi the molding'sand"andi-which if-not prevented cause'sa greatdeal'of-excessive wear.

An object otmy'inventionis-'to provide a construction whichl shields-the exposed' portion of the relativelyvmovable ypiston' Ofithe lifting-means during the jolting operations;

Another objecty .of my invention is'theprovison of an anvil vwhich is sf-iparatcd frorn-v 'theL lifting means thatraisespthe fjolt table.

Another object of'myinvention is the provision ofa shield which surrounds thelifting-means-f the` j olt-table to jprotectthe-relatively movable exposed portion of the lifting meansv'fromsand or other foreignmaterialduring-operation, the shield functioning also as an1 anvilupon v-Wliich-`the jolt table mayy strike to aid'in lcompactingfthe molding sander other material. s

Another object-ofmy'inventionis toexiifaust the compressed `arir ori-other Huid from Vthe lifting means in such a direction and"l`ocalityy asito prevent any moldlngwsanidi or-ot' Yer.y forelgnmaterial from contacting the relativelymovablepartsfof theliftin'gmeans'.

Another object lofl myfinvention,issthevproyislon of an oil or'lubricantrnesemoirrinmtwhich-the 5:.fClams. (Cl. 22-45) relatively movable parts oftheliftingmeans may be immersed'fin orderto provide-completelubricationfor-the relatively movable parts of the lifting means;

Another .objectsofJn/iy inventionisthe provision of` exhausting the-compressedy afin-ory otheruid rdly through theregion where the joltltable oi the shell or shield which surrounds the-liftingvmeans, lso thatfjust prior-to the ltimethe `jolt table strikesA theanvil, exhaustlair is owing Aoutwardlyfto prevent any molding sandlorvforeign material from enteringthe surrounding chamber during the descending movements of `they jolt table.

Another lobjectief my invention is to avoid the I construction of vemploying the relatively movable parts of thelifting means asthe anvil andhamvmerfor producing the jolt on the work' table, thereby eliminatingthe peening` ofthe members which might otherwise interfere with the reciprocal movements ofthefrelativelyfmovable parts of the liftingmeans.

Another-object of 'my invention is the provision of a jolt table 'having atleasttwo annular reinforcing ribs whichproject downwardly `from the underneath-side ofthe -jolting table, the inner rib terminating'inthe cylinderl which comprises part of f the Llifting means, and 'f the'- outer-rib terminating-ina hammer surfacevfor striking an anvil.

Anotherobject of the present invention is t0 Yprovide an improved `means for lubricating-the relatively movable parts of `the jolt machine by admitting to the air supply,r aV predetermined quantity of-oil and introducing the oil laden air 4into the piston chamberwhere it will now downwardly 'between the piston and cylinder bythe air 'pres-sure.

Anotherl objectl ofthe-ly present' invention ls tjo provide s an oil chamber Within. thel shield; so that the oil contained therein may contact the-exposed part of the piston during the jolting operation.

Anothervobject of the present invention iis to providea jolt machine of thetype referredto-having a stationary piston which isremovably-mounted on -the-machin ein a mannerftoaiiordfreplacement and installation in a simple andv eflcient manner;

'Other objects anda fullerunderstanding may be hadfby referring to'theffollowing description andkclaims taken in conjunction-with theaccompanylng.y 'drawings in which:

'Figurer `1.fis a yl-ront, elevationalV view-of= a jolt molding-machine, thesright halfv being-shown in ,cross-section tofzllustrate: the,V constrnctlnxmic 'of i the relatively movable parts of the vand cylinder 29 The upper end a fiat annular I As shown in Figures l partition 22 spaced lar depending flanges construction; namely,

the parts, the section being taken along the line 2-2 of Figure 2;

Figure 2 is a top plan view of a jolt molding machine embodying the features of my invention;

Figure 3 is a side elevational view of the machine shown in Figure l; and

Figure 4 is a transverse cross-sectional view, taken along the line lie-9 of Figure 2, and showing further details of the structure.

With reference to the drawings, my jolt machine comprises generally a base i0, a jolt table .24, a fluid pressure ing a piston I8 and a cylinder 29 interposed between the base I9 and the jolt tablez24, an outer tubular shell Il projecting upwardly from the base and terminating in an anvil I2 against which the jolt table strikes to aid in compacting the molding sand or other material. f

The base I9 may be of any suitable shape and i has a relatively flat bottom adapted to rest upon la suitable foundation, and is preferably constructed of a semi-steel casting.

The outer tubular shall I`I may be integrally formed with the base Ill and projects upwardly therefrom and i serves not only as an anvil against which the jolt table ,29 may strike, but also as a protecting shield to prevent molding sand or other foreign abrasive substances from coming in contact with piston I8 which comprise the fluid pressure lifting mechanism for the jolt table. of the anvil I2 is provided with face I3 against which the jolt table strikes. The base Iii is further formed with an inner tubular extension Ill which projects axially upwardly therefrom for a relatively short distance, there being a plurality of webs I5 between the adjacent inner and outer tubular members and spaced apart in angular relation. The

base I0 is further formed with a bore I6 extending' upwardly from its flat bottom, and the bottom of the bore adjacent the inner extension I4 is provided with a at annular attaching face I1.

vA piston I8 has its lower portion securely mounted in the inner tubular extension i9 and its lower portion isl closed by an integral end wall I9. The lower end of the piston I8 is furtherprovided with an integral outwardly extending marginal flange 2l) having a flat annular face which engages the adjacent lattaching face I1 and which is secured to the base I9 by a plurality of machine screws 2I or any other suitable means. The piston is thus readily removable. The upper end of the piston I8 is open and projects beyond the annular face I3 of the anvil I2.

1 and 4, the piston I8 is provided with an integral transversely extending intermediate the two ends of the piston. A tapped opening is provided in the partition 22 and is normally closed by a threaded plug 23.

The jolt table 24 is preferably constructed of a semi-steel-casting and is disposed to rest upon the anvil I2 of the upper end of the tubular shell Il in substantiallya horizontal position. The jolt table .24 has preferably a at upper surface 25 and has upon its underneath side three annuor ribs to reinforce the an outer flange 26, an intermediate flange 21 and a central flange which constitutes the cylinder 29. The outer` `flange 26V extends downwardly from the marginal 'edge of the jolt table. The flange .1` projects down- .wardlyat'an intermediate radial annularlocalifting mechanism compris or other material.

tion and constitutes a hammer for striking the anvil. The flanges are preferably integrally formed with the jolt table and aid in reinforcing the jolt table whereby it may withstand the heavy shocks to which it is subjected during the jolting operation. The annular flange or extension 21, is substantially in alignment with the anvil I2 and is provided with a flat annular face 28 adapted to strike vthe anvil I2 to effect compacting of the molding sand 'or other material. The jolt cylinder 29 is preferably integrally connected to the underneath side of the jolt table 24 and constitutes a reinforcing annular rib or extension for the jolt table. The lowermost end of the jolt cylinder 29 is inwardly tapered at 30 to offer a guide when mounting the jolt cylinder 29 over the piston i8. It is to be noted that the three flanges separate from their function of reinforcing the strength of the jolt table have additional functions in that the outer flange 26 operates as an apron to guard the operator from the anvil, the inner ange .21 has the function of a hammer for striking the anvil f2, and the inner flange has the function of the cylinder 29. The cylinder is not used as a hammer and thus my construction avoids peening of the cylinder which would otherwise occur if the cylinder were used as a hammer.

The piston I8 is provided with a plurality of peripheral grooves 3l, preferably adjacent to the upper end thereof, which when the machine is in operation, receive a lubricant. When the grooves are filled with the lubricant, a fluid seal is effected between the piston and the cylinder. I preferably dispense with the use of the cusnd that when the peripheral grooves are once filled with a lubricant they function very lsatisfactorily for making a good seal. i l

Fluid under pressure is extensible piston chamber, formed by the piston I8 and the cylinder 29, through means of an extension pipe 33 having its inner end threadably connected in an Vopening 32 of the wall of the piston and having its outer end passing through an opening 35 in the anvil I2. kThe cylinder 29 has a slot 34 provided therein through which the pipe 33 extends, so that the cylinder may not interfere with the pipe while the cylinder is being reciprocated. In operation, the jolt table is raised a predetermined. amount, then the fluid within the extensible piston chamber is exhausted out through exhaust ports 31 provided in the wall of the jolt cylinder 29 at a predetermined distance below the upper end of the piston I8, when the jolt table is resting upon the anvil I2.l The fluid under pressure exhausts out through these exhaust ports after the jolt table has been raised a predetermined amount and thus the jolt table is permitted to drop by gravity andstrike the anvil for effecting the jolting operations to aid in compacting the molding sand The air as it exhausts from the ports 31, passes outwardly between the underneath side ofthe flange 21 and the top surface of the anvil I2, whereby the outward exhausting of the compressed air tends to prevent any molding sand or any other foreign abrasive materials from entering into the protecting chamber III which surrounds the cylinder 29 and the exposed portion ofthe piston I8 when the jolt table is raised.

It is noted, that the protecting chamber lli 'which comprises the annular space between the introduced into they algemene ory closed by 'thenI annular flange;21n resting upon the'` anvilv l2' at .the instant that:.thezjoltzioccurs which is alsol the; instance whenr the .molding sand or other f foreignA materials;l ismost :apt to;-.befflying about. That. vis toI say,l the: combination Aoi the outer annular rib `2 .1r and..g thewtubular shell `|:I1 constitutes av shield for preventingrmoldin-glfsan'dr'or other abrasive materialf from x coming.: .1in contact with the exposed part of'. theipiston" lwhenfthe cylinder 29 is raised.

In order that. the wearingfxsurfiacerbetweenthe piston I8 and the: cylinder1529may=beoproperly lubricated, I', provide yfior passing: the; fluid: under pressure, rst through a uidfreservoir f3.8 containing a lubricant, afterwhichrtlrelubricantladen air passes-*through a ,controlfval've' *4Z-Fand a regulating valve 48 into the pipei 33; The regulatingvalveL18-functions to maintain thev pressure of the duid at'substantiallyia constant' value'. In operating themachine, it isonlyrnecessaryffor the operator to open theY valve 4'2 whichl admits. air under pressure; into thexextensible fluidtnpiston chamber for raising. thefjolt ta'b1e.2ll, aite'rwhich the Huid is exhausted` out` through the-'ports` 3J which permit the jolt tableito` fall'by the lforce of gravity andstrike theanvil' I2. AThe reciprocal operations are thus automatic; 'TheV compressed :The oil or other lubricant, whichv1s carried by the fluid under pressure condensesfinfthewupper: part ofthe extensible piston *chamber andf'tlien Works" its Way down between thewearing surfaces of the 'The' cilzgroovesl '31 become lled with the oilwhich makeswa good seal between thel piston and the cylinder. In

continuous operation, the condensed `oil worksv of the piston is well lubricated whenlthevcylinder 29 is raised during the jolting operation..

To assure straight movement of the jolt table A having its upper end vsecurely connected to the jolt table 2t and having itsremainingportion adapted to' reciprocate within a bushing A.'53 provided in a lateralu extension ,52 formed yintegrally with theanvil l'2'. The guide pin. 5.1. thus operates to insure straight up-and-downymovements ofthe j citing-table duringloperation;

The piston I8' in my construction is.,rea'dily removable' andthus" may be replaced by a new fmost. position.

war-diy between the piston and cylinder.

featuresxwhiohf are present in :myiinvention` and 'not present in previous types of machines;

namely, (fl) the protectingcham'ber 4| which. is iilled with. lubricant above the section of the pistonwhic'h becomes exposed when the joltjtable iselevated to its uppermost position, and (2). the protecting shield il which prevents molding sand andother abrasive material from contacting the ypistony when the jolt table is raised to its upper- 'Ihe exposed part of the piston is always immersed in ka body of lubricant which "means that my construction wears very little las compared to prior art constructions.

Yactual experience that my construction eliminates a; vast' portion of this expensive repair incident to mounting oversized pistons and regrinding the inside wall of the cylinder.

Although I have described my invention in its preferred form with a certain degree of particuylarity, it is understood that the present disclosure lofzthe preferred form has been made only by Way ofexample detailsof construction and the combination and `arrangement of parts may be resorted t-o without departing'from the spirit and the scope of the invention as hereinafter claimed.

l/Vhat is claimed is:

l. A molding machine comprising a base, a shellprojecting upwardly from said base and havingl at its upper end a striking anvil, a jolt table having on the underneath side thereof a surface for striking the anvil, a piston supported and carried by the base and extending upwardly therefrom toward the jolt table, a cylinder surrounding; the piston for raisingthe table relative to the anvil, said piston and cylinder dening an extensible` iiuid pressure chamber, an inlet for introducing uid under pressure into said chamfber ktoraisothe jolt table relative to the anvil,

an outlet through which huid-may be exhausted from said chamber for permitting the table to return bygravity and strike the anvil, said outlet being controllable by the relative movements of thel piston andthe cylinder, said piston and 'cylindereach having a portion slidably engaging one another, said piston portion 'being externaly eXposed-whensaid cylinder is raised, saidcylinder ,extending downwardly from the table and terminating. at` a place below the anvil within said shell, whereby when the cylinder is raised the exposed portion or the piston is below the anvil and shielded by said shell.

2. A molding machine comprising a base, a shell projecting tensible fluid pressure chamber, an inlet for introducing duid under pressure into said chamber to raise the jolt table relative to the anvil, an outlet through which iiuid may be exhausted from said chamber for permitting the table to return by gravity and strike the anvil, said outlet being controllable by thev relative movements of the piston and the cylinder, said piston and cylinder each having a portion slidably engaging one another, said piston portion being externally exposed when said cylinder is raised, said cylinder extending downwardly from the table and terminating at a place below the anvil within said shell, whereby when the cylinder is raised the exposed portion of the piston is below the anvil and shielded by said shell, said shell providing in combination with said piston a lubricant reservoir, whereby a lubricant contained therein may contact the said exposed portion of said piston.

3. A molding machine comprising a base, a. shell projecting upwardly from said base and having at its upper end a striking anvil, a jolt table having on the underneath side thereof a surface for striking the anvil, a piston supported and carried by the biase and extending upwardly therefrom toward the jolt table, a cylinder surrounding the piston for raising the table relative to the anvil, said piston and cylinder defining an extensible fluid pressure chamber, an air inlet for introducing fluid under pressure into said chamber to raise the jolt table relative to the anvil, the wall of said cylinder having an air out-` let opening disposed a predetermined distance downwardly from the upper end of said piston which outlet is initially closed by the latter but opened upon predetermined rising of said cylinder to exhaust air from the said chamber and permit the table carried by the cylinder to return by gravity and strike the anvil, said piston and cylinder each having a portion slidably engaging one another, said piston portion being externally exposed when said cylinder is raised, said cylinder extending downwardly from the table and terminating at a place below the anvil within said shell, whereby when the cylinder is raised the exposed portion of the piston is below the anvil and shielded by said shell.

4. A molding machine comprising a base, a shell projecting upwardly from said base and having at its upper end a striking anvil, a jolt table having on the underneath side thereof a surface for striking the anvil, a piston supported and carried by the base and extending upwardly therefrom toward the jolt table, a cylinder surrounding the piston for raising the table relative to the anvil, said piston and cylinder defining an extensible fluid pressure chamber, an air inlet for introducing fluid under pressure into said chamber to raise the jolt table relative to the anvil, the wall of said cylinder having an air outlet opening disposed a predetermined distance downwardly from the upper end of said piston which outlet is initially closed by the latter but opened upon cylinder to exhaust air from the said chamber and permit the table carried by the cylinder to return by gravity and strike the anvil, said piston and cylinder each having a portion slidably Aengaging one another, said piston portion being externally exposed when said cylinder is raised, said cylinder extending downwardly from the' table and terminating at a place below the anvil within said shell, whereby when the cylinder is raised the exposed portion of the piston is below the anvil and shielded by said shell, said outlet opening being in the neighborhood of the anvil and directing exhaust air outwardly therefrom between the anvil and the table.

5. A molding machine comprising a base, a shell projecting upwardly from said base and having at its upper end a striking anvil, said base being further provided with an inner tubular extension projecting upwardly therefrom and terminating below the striking anvil, a jolt table having on the underneath side thereof a surface for striking the anvil, a piston removably supported in said tubular extension and extending upwardly therefrom toward the jolt table, a cylinder surroundingthe piston for raising the table re1 ative to the anvil, said piston and cylinder dening an extensible fluid pressure chamber, an inlet for introducing fluid under pressure into said chamber to raise the jolt table relative to the anvil, an outlet through which iiuid may be exhausted from said chamber for permitting the table to return by gravity and strike the anvil, said outlet being controllable by the relative movements ofthe piston and the cylinder, said piston and cylinder each. having a portion slidably engaging one another, said piston portion being externally exposed when said cylinder is raised, said cylinder extending downwardly from the table and terminating at a place below the anvil within said shell, whereby when the cylinder is raised the exposed portion of the piston is below the anvil and shielded by said shell.

LESTER C. YOUNG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 908,002 Herman et al Dec. 29, 1908 1,004,708 Stoney Oct. 3, 1911 1,106,671 Mumford Aug. 11, 1914 1,379,421 Shaffer et al. May 24, 1921 1,793,012 Ringle Feb. 17, 1931 2,102,377 Nicholls et al Dec. 14, 1937 2,371,980 Pritchard Mar. 20, 1945 predetermined rising of said`- 

